Floating caliper type disc brake

Abstract

A pair of engaging protrusions provided in a support member and a pair of engaging grooves provided in a back plate of a pad are engaged with each other, and the pad is capable of being displaced only in the axial direction of a rotor. Each engaging protrusion is composed of a rising section and a bent section which is bent at the tip end of the rising section at a right angle. The rising section composes a brake torque bearing section, and the bent section composes a rotation preventing section of the pad. The pad is prevented from rattling with respect to the support member by first and second pad clips.

What is claimed is:  
     
       1. A floating caliper type disc brake comprising: 
       a support member fixed to a vehicle body and arranged adjacent to a rotor rotatable with a wheel, said support member including a run-in side support engaging section arranged in an end section on a rotor run-in side thereof and a run-out side support engaging section arranged in an end section on a rotor run-out side thereof, the run-in side and run-out side support engaging sections being respectively formed into a substantially L-shaped engaging protrusion having a rising section arranged in the radial direction of the rotor and a bent section bent at a tip end of the rising section in the circumferential direction of the rotor;  
       a pair of pads arranged on both sides of the rotor opposing to each other, each pad including a back plate, a lining on a face on one side of the back plate opposing to the side of the rotor, a run-in side pad engaging section arranged in a run-in side end section of the back plate being slidably engaged with the rotor run-in side support engaging section, and a run-out side pad engaging section arranged in a run-out side end section of the back plate being slidably engaged with the rotor run-out side support engaging section, the run-in side and run-out side pad engaging sections being respectively formed into a substantially L-shaped engaging groove corresponding to the engaging protrusion, so that the run-in side and run-out side pad engaging sections can be freely slid in the axial direction of the rotor;  
       a caliper supported by said support member and freely displaced in the axial direction of the rotor; and  
       a piston housed in said caliper and freely pushed out toward the rotor according to supply of hydraulic fluid into said caliper,  
       wherein braking is conducted by pushing said pair of pads against both sides of the rotor when said piston is pushed out, and  
       wherein a correlation of a distance between the run-in side and run-out side support engaging sections with a distance between the run-in side and run-out side pad engaging sections is restricted so that at least one of said pad engaging sections bears a brake torque with one of the run-in side and run-out side support engaging sections when the brake torque according to a frictional force caused between the side of the rotor and the lining of said pad is not higher than a predetermined value, and both said pad engaging sections the brake torque with both the run-in side and run-out side support engaging sections when the brake torque according to the frictional force caused between the side of the rotor and the lining of said pad exceeds the predetermined value.  
     
     
       2. The floating caliper type disc brake according to  claim 1 , further comprising: 
       a pad clip pushing one of the run-in side and run-out side end sections of the back plate in the radial direction of the rotor, said pad clip provided between the run-in side support engaging section and the run-in side pad engaging section or between the run-out side support engaging section and the run-out side pad engaging section.  
     
     
       3. The floating caliper type disc brake according to  claim 2 , wherein said pad clip pushes one of the run-inside and run-out side end sections of the back plate in the rotary direction of the rotor in a state of running forward, said pad clip provided between at least one of the run-in side and run-out side support engaging sections and the pad engaging section engaging with the one of the support engaging sections. 
     
     
       4. The floating caliper type disc brake according to  claim 1 , further comprising: 
       a pad clip pushing one of the run-in side and run-out side end sections of the back plate in the rotary direction of the rotor in a state of running forward, said pad clip provided between at least one of the run-in side and run-out side support engaging sections and the pad engaging section engaging with the one of the support engaging sections.  
     
     
       5. The floating caliper type disc brake according to  claim 2 , wherein said pad clip is corrosion-resistant and interposed between the sliding faces of the run-in side support engaging section and the run-in side pad engaging section or of the run-out side support engaging section and the run-out side pad engaging section so that the sliding faces are prevented from corrosion. 
     
     
       6. The floating caliper type disc brake according to  claim 3 , wherein said pad clip is corrosion-resistant and interposed between the sliding faces of the run-in side support engaging section and the run-in side pad engaging section or of the run-out side support engaging section and the run-out side pad engaging section so that the sliding faces are prevented from corrosion. 
     
     
       7. The floating caliper type disc brake according to  claim 4 , wherein said pad clip is corrosion-resistant and interposed between the sliding faces of the run-in side support engaging section and the run-in side pad engaging section or of the run-out side support engaging section and the run-out side pad engaging section so that the sliding faces are prevented from corrosion.